Missy responds on instinct, hitting the deck, while protecting the two civvies with her body. It likely isn't terribly comfortable for the civvies in question. Heck, if she dropped the full weight of her power armour on them, it'd possibly be fatal. But it's definitely more comfortable than tentacle acid or the rubble that's going to be flying everywhere once the main segment hits.
((If you mean this to be a regular Nexus character, this is the wrong thread, as it's sort of a doomed splinter timeline. If you want to play in the doomed timeline though, then this is fine. You can also have the same character in both. ))